U.S. Commerce Secretary Wilbur L. Ross Jr. has a stake in a shipping firm that receives millions of dollars a year in revenue from a company whose key owners include Russian President Vladimir Putin’s son-in-law and a Russian tycoon sanctioned by the U.S. Treasury Department as a member of Putin’s inner circle.

Ross, a billionaire private equity investor, divested most of his business assets before joining President Donald Trump’s Cabinet in February, but he kept a stake in the shipping firm, Navigator Holdings Ltd., which is incorporated in the Marshall Islands in the South Pacific. Offshore entities in which Ross and other investors hold a financial stake controlled 31.5 percent of the company in 2016, according to Navigator’s latest annual report.

Wilbur Ross (center) and Jared Kushner (second from left) on an official trip to Saudi Arabia. Both Ross and Kushner were tied to Russian money in the Paradise Papers. (photo: The White House)

Among Navigator’s largest customers, contributing more than $68 million in revenue since 2014, is the Moscow-based gas and petrochemicals company Sibur. Two of its key owners are Kirill Shamalov, who is married to Putin’s youngest daughter, and Gennady Timchenko, the sanctioned oligarch whose activities in the energy sector, the Treasury Department said, were “directly linked to Putin.”

Another powerful owner is Sibur’s largest shareholder, Leonid Mikhelson, who controls an energy company that was also sanctioned by the Treasury Department for propping up Putin’s rule.